Azienda coinvolta
Phone interview: brush up on your iOS basic concepts, i.e., delegation, cell reuse, notifs, classes vs structs, memory management, async apis, persistence... any of these is totally fair game. On-site: Come as you are. The project they give you is nothing more complex than the work you do on a daily basis. You likely won't have some of the tools that you normally use at your office, so review a lot of the iOS basics, especially if your team is using Rx, IGListKit, etc.